2nd baby registry

So we just found out we are expecting baby #2. Our little one will be 2-3 months shy of her 3rd birthday.

I'm sure we won't need much because we already learned so much from our first one. She hated everything except the ergobaby and Moby. So we wasted a lot of money and sooo Many baby items that weren't needed.

If you and kids around this age together what were some items that helped.

I'm also debating on getting a double stroller. We currently have the minu and Cruz v2. I was just thinking of getting the piggyback for the Cruz. Or would you suggest a double stroller.

Thanks in advance!